JP2012052416A - Method for making shield machine pass to underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for making a shield machine pass to an underground structure, which can withstand earth and water pressure to the underground structure even when a segment made of an inexpensive plain concrete is used and easily make the shield machine pass to the underground structure without welding or removing the underground structure.SOLUTION: A reinforcement member 19 is repeatedly towed and cut. Towing of the reinforcement member 19 is stopped just before the reinforcement member 19 comes off a shield passing portion 5 and a water-blocking packer 17b because if the reinforcement member 19 comes off the water-blocking packer 17b, muddy water 73 within an entrance room 69 leaks from the water-blocking packer 17b into a shield tunnel 1. In the state described above, the reinforcement member 19 is connected with the water-blocking packer 17b. A wire 75 is removed from the reinforcement member 19. The reinforcement member 19 has a role as a water-blocking cover by sealing the water-blocking packer 17b.

Description

  The present invention relates to a shield machine passing method to an underground structure such as a shield tunnel or a caisson shaft.

  Conventionally, as a method of starting a shield machine from inside an underground structure such as a shield tunnel, the ground is improved by injecting chemicals into the outside of the underground structure of the start section, reinforcing the start section, etc. Was removed by dismantling, fusing, etc., and the shield machine was started. For this reason, the shield machine starting part required a lot of time before starting the shield machine, and the removal or fusing of the segments was a dangerous operation.

  As a method of starting a shield machine from such an underground structure, for example, there is a method of constructing a shield machine start part of a shaft with concrete reinforced with a high-strength fiber sheet or the like (Patent Document 1, Patent) Reference 2).

  In addition, there is a method in which high-toughness concrete is combined with a steel segment to reinforce a part of the segment corresponding to the start port of the shield machine, and the start-up port is made of high-toughness concrete (Patent Document 3).

JP-A-8-68294 Japanese Patent Laid-Open No. 11-200761 Japanese Patent Laid-Open No. 2003-253992

  However, in the inventions described in Patent Document 1 and Patent Document 2, it is not necessary to melt or remove a part of the underground structure corresponding to the shield machine starting part, but a tough sheet or the like is very expensive. Therefore, there is a problem that the construction cost is increased.

  Moreover, in the invention described in Patent Document 3, there is a problem that it is necessary to use a segment having a special structure, and high toughness concrete is very expensive.

  The present invention has been made in view of such problems, and the purpose thereof is to withstand the earth and water pressure to the underground structure even using a segment using inexpensive unreinforced concrete, An object of the present invention is to provide a method for passing a shield machine to an underground structure, which can easily pass the shield machine to the underground structure without melting or removing the underground structure.

  In order to achieve the above-described object, the present invention is a method of passing a shield machine through an underground structure, wherein a shield passage portion of the underground structure is formed of unreinforced concrete, and a reinforcing member is provided in the shield passage portion. A step of providing a frame so as to surround the shield passage portion, a liquid is injected between the underground structure and the frame, and the water pressure in the frame is controlled by the underground structure. A step c that is substantially equivalent to an external earth water pressure; a step d that extracts the reinforcing member; and a step e that excavates the shield passage portion with a shield machine. In the step a, one of the reinforcing members A first water stop member is provided in the vicinity of the end of the first water stop member, and in the step d, the reinforcement member is moved to the first water stop member before the tip of the reinforcement member comes out of the first water stop member. An underground structure characterized by fixing A shield machine passing way to the body.

  In the step a, a second water stop member is further provided in the vicinity of the other end of the reinforcement member, and in the step d, the tip of the reinforcement member is in the second water stop member. It is desirable to provide a water stop lid at the end of the second water stop member.

  The underground structure is a shield tunnel, and the step a is a step of installing a segment having an unreinforced concrete portion in the shield passage portion of the shield tunnel while constructing the shield tunnel by a shield machine, The step d may extract the reinforcing member in the circumferential direction of the shield tunnel, or the underground structure is a caisson shaft, and the step a forms the shield passing portion of the caisson with unreinforced concrete. It is a process, and further comprises a process f for laying the caisson after the process a, and the process d may extract the reinforcing member in a substantially vertical direction or a substantially horizontal direction in the caisson shaft.

  In the step a, a load transmission member may be provided between the reinforcing member and the underground structure, and in the step a, a guide for the reinforcing member may be provided.

  According to this invention, since the passage part of a shield machine is formed with unreinforced concrete, a shield machine can be started without performing fusing and removal of a segment. Further, since the reinforcing member is provided, it is possible to withstand the earth pressure from the outside without using expensive high toughness concrete or the like.

  In addition, if the inner surface of the structure is filled with a liquid such as muddy water before removing the reinforcing member, and the pressure is equivalent to the soil water pressure from the outside, even when the reinforcing member is removed, the shield passage part will be exposed from the outside of the structure. Can withstand soil water pressure. Furthermore, if a load transmitting member is installed between the reinforcing member and the underground structure, the reinforcing member can efficiently receive the load from the underground structure, and if a guide for the reinforcing member is provided, the reinforcing member The reinforcement member does not fall down when removing. Therefore, without using special high toughness concrete, the shield machine can be easily passed without enduring earth and water pressure from outside and without fusing or removing the underground structure in the shield machine passage part.

  According to the present invention, even if a segment using inexpensive unreinforced concrete is used, it is possible to withstand soil water pressure on the underground structure, and it is possible to easily move to the underground structure without fusing or removing the underground structure. The shield machine passage method to an underground structure which can let a shield machine pass can be provided.

The figure which shows the external appearance of the shield tunnel 1. FIG. The figure which shows the shield passage part 5 vicinity seen from the inner surface of the shield tunnel 1. FIG. It is a figure which shows the unreinforced concrete segment 7, (a) is a figure which shows the unreinforced concrete segment 7a, (b) is a figure which shows the unreinforced concrete segment 7b. The figure which shows the reinforced steel segment 9. FIG. The figure which shows the state which provided the reinforcement member 19 in the inner surface of the unreinforced concrete segment. The figure which shows the state in which the entrance room 69 was provided by the frame 65. FIG. The figure which shows the state by which the muddy water 73 was inject | poured into the entrance room 69. FIG. The figure which shows the state which pulls out the reinforcement member 19. FIG. The figure which shows the state by which the water stop lid 79 was provided in the water stop packer 17a. The figure which shows the state which pulls, cutting the reinforcement member 19. FIG. The figure which shows the state by which the reinforcement member 19 was fixed to the water stop packer 17b. The figure which shows the state which starts the shield machine 71 from the caisson shaft 85. FIG.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a diagram showing a shield tunnel 1 according to an embodiment of the present invention.

  The shield tunnel 1 as an underground structure is composed of a plurality of segments. At the side of the shield tunnel 1, a branch shield is provided in the planned branch shield part 3, and the shield tunnel 1 is connected to the shield tunnel 1 at the shield passage part 5.

  In a portion corresponding to the shield passage portion 5, an unreinforced concrete segment 7 is provided instead of the normal segment. Side reinforcing segments 11 are provided on both sides of the unreinforced concrete segment 7 installed in the shield passage portion 5 (in the axial direction of the shield tunnel 1). Further, a reinforcing steel segment 9 is provided at a portion adjacent to the unreinforced concrete segment 7 in the circumferential direction.

  FIG. 2 is a view showing the vicinity of the shield passage portion 5 as seen from the inside of the shield tunnel 1. A portion corresponding to the shield passage portion 5 is provided with an unreinforced concrete segment 7, and a reinforcing steel segment 9 is joined in the tunnel circumferential direction of the unreinforced concrete segment 7. Side reinforcement segments 11 are provided in the tunnel axis direction of the unreinforced concrete segment 7 provided in the shield passage portion 5, and general segments 13 are provided in other portions.

  In addition, the side part reinforcement segment 11 is a segment which has a reinforcement function at the time of a shield passage, is a little narrower than the general segment 13, and is reinforced with a rib etc. The general segment 13 may be a conventionally used segment such as a steel segment, an RC segment, or a synthetic segment.

  A bracket 15 is provided on the reinforcing steel segment 9. A plurality of reinforcing members 19 are provided on the inner surface of the unreinforced concrete segment 7 in parallel in the axial direction of the shield tunnel 1 so as to cover the shield passage portion 5. The reinforcing member 19 is a rod-shaped member, and is an arc-shaped member along the circumferential inner surface of the shield tunnel 1. Both ends of the reinforcing member 19 are fixed by brackets 15 of reinforcing steel segments 9 connected to both sides of the unreinforced concrete segment 7 respectively.

  In the vicinity of the joint between the unreinforced concrete segment 7 and the reinforced steel segment 9, a water stop packer 17 is provided. The reinforcing member 19 penetrates the water blocking packer 17. The water stop packer 17 prevents water from entering the reinforcing steel segment 9 along the reinforcing member 19.

  FIG. 3 is a diagram showing an unreinforced concrete segment, FIG. 3 (a) is a diagram showing an unreinforced concrete segment 7a, and FIG. 3 (b) is a diagram showing an unreinforced concrete segment 7b.

  As the unreinforced concrete segment 7, the unreinforced concrete segment 7a as shown to Fig.3 (a) can be used. The unreinforced concrete segment 7 a is made of unreinforced concrete 21. In addition, it is desirable to embed a reinforcing bar etc. other than the part corresponding to the shield passing part. In particular, reinforcement of the joint between rings is necessary at the joint. Bent bolt holes 23a and 23b are provided on the inner surface side and the side surface of the unreinforced concrete segment 7a. The bent bolt holes 23a and 23b are used when the adjacent bolts are joined by the bent bolt. In addition, the joint of the segments provided in the shield passage part 5 is a material that can be cut by a shield machine, or a steel joint plate is not required like a bent bolt, and the bolt may be removed before passing the shield. It shall be possible. Ordinary bolts and joint plates may be provided at joint portions other than the shield passage portion 5.

  Moreover, as the unreinforced concrete segment 7, the unreinforced concrete segment 7b as shown in FIG.3 (b) can also be used. In the unreinforced concrete segment 7b, a portion corresponding to the shield passage portion is partitioned by a frame plate 41 with respect to a normal steel segment including the skin plate 29, the joint plate 33, the side plate 31, the vertical rib 35 and the like. The unreinforced concrete 25 is provided in the region partitioned by the frame plate 41. The joint plate 33 and the side plate 31 are provided with a joint hole 37 and a joint hole 39, respectively. The unreinforced concrete 25 is provided with a bent bolt hole 27. The joint hole 37, the joint hole 39, and the bent bolt hole 27 are joint portions with adjacent segments.

  FIG. 4 is a diagram showing the reinforced steel segment 9. The reinforcing steel segment 9 is provided with a bracket 15, a water-stop packer 17, and the like with respect to a normal steel segment constituted by a skin plate 43, side plates 45, joint plates 47, vertical ribs 49, and the like. One joint plate 53 of the reinforcing steel segment 9 is higher than the height of the reinforcing steel segment 9 and is provided with a reinforcing member hole 59.

  The reinforcing member hole 59 is a hole through which the reinforcing member 19 passes. A water stop packer 17 is provided on the back surface of the joint plate 53 of the reinforcing member hole 59. The water stop packer 17 is a cylindrical member, and the inner surface is sealed. For this reason, when the reinforcing member 19 is inserted into the water blocking packer 17, water does not enter from the front side of the joint plate 53 to the back surface of the water blocking packer 17.

  A bracket 15 is provided behind the water stop packer 17. The bracket 15 is a member for fixing the end of the reinforcing member 19. That is, the reinforcing member 19 passes through the reinforcing member hole 59 and the water blocking packer 17, and the end portion is fixed to the bracket 15.

  The joint plates 47 and 53 and the side plate 45 are provided with joint holes 57 and joint holes 51, respectively, and are used for joining adjacent segments. The form of the reinforcing steel segment 9 is not limited to that shown in FIG. 4, and the installation position and the number of installations of the water stop packer 17 and the bracket 15 can be changed as needed. Accordingly, the shape of the vertical rib 49 can be changed, or a rib parallel to the side plate 45 can be provided separately.

  Next, the shield machine passing method according to the present embodiment will be described. 5 to 11 are diagrams showing a shield machine passing method according to the present embodiment, and are views taken along line AA in FIG.

  First, as shown in FIG. 5, the shield tunnel 1 is constructed by the unreinforced concrete segment 7, the reinforcing steel segment 9, and the like. Although the shield passage portion 5 is made of unreinforced concrete, the reinforcement member 19 is provided on the inner surface of the unreinforced concrete segment 7 because the unreinforced concrete alone cannot withstand the earth and water pressure from the outside of the shield tunnel 1. It is done. That is, assuming that the unreinforced concrete segment 7 is a formwork, the reinforcing member 19 has a role of supporting work.

  The installation method of the reinforcing member 19 is as follows. For example, when the lower reinforcing steel segment 9 is installed first, after joining the unreinforced concrete segment 7, the end of the reinforcing member 19 is passed through the water blocking packer 17 a. Then, when installing the upper reinforcement steel segment 9, it installs so that the edge part of the reinforcement member 19 may be inserted in the water stop packer 17b. Next, both ends of the reinforcing member 19 are fixed to the bracket 15. The reinforcement member 19 and the bracket 15 may be joined by welding or bolt fixing.

  When there is a gap between the reinforcing member 19 and the unreinforced concrete segment 7, the reinforcing member 19 cannot efficiently receive the load that the unreinforced concrete segment 7 receives from the outside of the shield tunnel 1. In this case, it is desirable to provide a load transmission member 61 between the reinforcing member 19 and the unreinforced concrete segment 7. As the load transmission member 61, a pair of wedge-shaped members may be driven into the gap between the reinforcing member 19 and the unreinforced concrete segment 7 at a predetermined interval, or the gap may be filled with mortar or the like.

  Next, as shown in FIG. 6, a frame body 65 is provided in the vicinity of the joint plate 53 (or a part of the reinforcing steel segment). The frame body 65 is a steel plate, for example, and is fixed by welding or the like. The frame body 65 is provided so as to surround the shield passage portion 5. That is, the frame body 65 is provided in a cylindrical shape so as to surround the shield passage portion 5, and an entrance room 69 of the shield machine is formed in a space surrounded by the frame body 65 and the unreinforced concrete segment 7.

  A packing 67 is provided at the end of the frame body 65 toward the opening side of the entrance room 69. The packing 67 is made of rubber or resin, and prevents muddy water or the like from the entrance room 69 from entering the shield tunnel 1 when the shield machine enters the entrance room 69. The shape of the frame body 65 may be other than the L shape as shown in FIG. 6, for example, a flat plate shape.

  The unreinforced concrete segment 7 is provided with a guide 63 as necessary. The guide 63 is for preventing the reinforcing member 19 from shaking in the axial direction of the shield tunnel 1 or falling down inside. The guide 63 is, for example, a half ring-shaped member, and the reinforcing member 19 may be sandwiched and a part may be fixed to the unreinforced concrete segment 7. The guide 63 is preferably made of resin, concrete, or the like that can be excavated by a shield machine.

  Next, as shown in FIG. 7, the tip of the shield machine 71 is inserted into the entrance room 69, and stops at a position before the tip of the shield machine 71 hits the reinforcing member 19. The tip of the shield machine 71 is accommodated in an entrance room 69 surrounded by a frame body 65, and the periphery is stopped by a packing 67. Before the shield machine 71 is inserted into the entrance room 69, the bent bolt or the like used in the joint portion between the unreinforced concrete segments 7 corresponding to the shield passage portion 5 is removed. If the bent bolt does not affect the excavation of the shield machine 71, it is not necessary to remove the bent bolt.

  In a state where the periphery of the shield machine 71 is sealed by the packing 67, the muddy water 73 is injected as a liquid into the entrance room. At this time, the pressure of the muddy water 73 in the entrance room 69 is adjusted so as to be substantially equal to the soil water pressure from the outside of the shield tunnel 1. Since the outer peripheral surface of the shield machine 71 is stopped by the packing 67, the muddy water 73 does not leak from the entrance room 69 into the shield tunnel 1. In addition, it can replace with the muddy water 73 and can also use a mud material etc. as a liquid.

  Next, as shown in FIG. 8, the reinforcing member 19 is extracted. The method of extracting the reinforcing member 19 is as follows. First, the bracket 15 joined to both ends of the reinforcing member 19 is removed. Next, the wire 75 is joined to the upper end of the reinforcing member 19. Moreover, the jack 77 is installed in the lower end part of the reinforcement member 19 as needed. The wire 75 is pulled in the direction B in the drawing and the reinforcing member 19 is pushed out in the direction indicated by the arrow C by the jack 77 to move the reinforcing member 19 along the guide 63 and the water stop packers 17a and 17b. When the reinforcing member 19 moves to some extent, the jack 77 is removed, and the reinforcing member 19 is pulled out only by pulling the wire 75. The pulling of the wire 75 is performed with a lever block (registered trademark) or the like using a pulley or the like as necessary.

  FIG. 9 is a view showing a state in which the reinforcing member 19 is moved and the reinforcing member end portion 81 is accommodated in the water blocking packer 17a. The pulling of the wire 75 is temporarily stopped in a state where the reinforcing member end portion 81 is accommodated in the water blocking packer 17a. This is because the muddy water 73 inside the water blocking packer 17a leaks into the shield tunnel 1 when the reinforcing member end 81 comes out of the water blocking packer 17a.

  In order to prevent the muddy water 73 from leaking from the water stop packer 17a, a water stop lid 79 is provided at the end of the water stop packer 17a with the reinforcing member end 81 inside the water stop packer 17a. The water stop lid 79 is not required to leak the muddy water 73 from the water stop packer 17a, and may be made of, for example, steel and fixed by welding or bolting.

  Next, as shown in FIG. 10, the reinforcing member 19 is pulled by the wire 75 and pulled out. In many cases, it is difficult to remove the reinforcing member 19 at a time. In this case, every time the reinforcing member 19 having a predetermined length is pulled out, the step of cutting the reinforcing member 19, fixing the wire 75 to the cut portion again, and pulling the wire 75 is repeated. When the reinforcing member 19 is pulled out, the load transmitting member 61 is naturally removed and settles in the entrance room 69.

  When cutting the reinforcing member 19, it is desirable to provide the fall prevention metal fitting 83 on the reinforcing member 19 between the water stop packer 17 b and the cut portion. This is to prevent the reinforcing member 19 from falling into the entrance room 69 when it is cut. The fall prevention metal fitting 83 is, for example, a ring-shaped steel member. If the fall prevention metal fitting 83 is fixed to the reinforcement member 19 with a bolt, the reinforcement prevention member 19 is cut while shifting the fall prevention metal fitting 83 each time the reinforcement member 19 is cut. Can continue. In this case, the portion protruding from the fall prevention fitting 83 becomes the cut portion 85. Further, the wire 75 can be connected to the fall prevention fitting 83.

  FIG. 11 is a view showing a state before the end portion of the reinforcing member 19 is removed from the water stop packer 17a. The pulling and cutting of the reinforcing member 19 are repeated, and the pulling of the reinforcing member 19 is stopped before the reinforcing member 19 is detached from the shield passage portion 5 and before the reinforcing member 19 comes out of the water stop packer 17b. This is because if the reinforcing member 19 is removed from the water-stop packer 17b, the muddy water 73 in the entrance room 69 leaks from the water-stop packer 17b into the shield tunnel 1.

  With the reinforcing member 19 detached from the shield passage portion 5, the pulling of the reinforcing member 19 is stopped before the reinforcing member 19 comes out of the water-stopping packer 17b. In this state, the reinforcing member 19 and the water-stopping packer 17b are joined. To do. Further, the wire 75 is removed from the reinforcing member 19. The reinforcing member 19 closes the water stop packer 17b and serves as a water stop lid.

  Thereafter, the shield machine 71 is started to pass through the unreinforced concrete segment 7. The shield passage portion 5 is made of only a digable material such as unreinforced concrete, and since there is no steel member in the excavation portion, it can be easily excavated. That is, the shield machine 71 can easily pass through the shield tunnel 1.

  According to the shield machine passing method to the underground structure according to the present invention, it is not necessary to improve the ground outside the passage part of the shield machine, and it is not necessary to melt and remove the segment. Can pass through the shield tunnel. In addition, since high-toughness concrete or the like is not used for the shield passage portion, the passage of the shield machine is inexpensive.

  Moreover, if the muddy water 73 is filled in the entrance room 69 before the reinforcing member 19 is removed and the pressure is equal to the external soil water pressure, the unreinforced concrete segment 7 is damaged by the soil water pressure even when the reinforcing member is removed. There is nothing to do. Furthermore, if the load transmitting member 61 is installed between the reinforcing member 19 and the unreinforced concrete segment 7, the reinforcing member can efficiently receive the load from the underground structure, and the guide 63 of the reinforcing member 19 can be used. If provided, the reinforcing member 19 will not be displaced when the reinforcing member 19 is pulled out.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, in the present embodiment, the case where the shield machine 71 is started from the inside of the shield tunnel 1 is shown, but the same method can also be used when the shield machine 71 reaches the shield tunnel 1. In this case, the reinforcing member may be removed after the entrance room 69 is separately sealed and muddy water is similarly injected therein to make the soil water pressure equal to the external soil water pressure.

  Moreover, in this Embodiment, although the example of the shield tunnel 1 was shown as an underground structure, another underground structure may be sufficient. For example, FIG. 12 is a diagram showing a case where the shield machine 71 starts from the caisson shaft 85. In the case of the caisson shaft 81, the shield passage portion 5 is previously formed of unreinforced concrete, and the reinforcing member 19 is provided inside. Both ends of the reinforcing member 19 are provided with water-stop packers 17a and 17b. Thereafter, the entrance room 69 is formed by the frame body 65 in the same procedure, and after the muddy water is poured into the entrance room 69, the reinforcing member 19 can be extracted and the shield machine 71 can be started.

DESCRIPTION OF SYMBOLS 1 ......... Shield tunnel 3 ......... Branch shield planned part 5 ......... Shield passage part 7 ......... Unreinforced concrete segment 9 ......... Reinforcement steel segment 11 ... Side part reinforcement segment 13 ... General segment 15 ... ... Bracket 17 ... Water blocking pack 19 ... Reinforcing member 21 ... Unreinforced concrete 23 ... Bent bolt hole 25 ... Unreinforced concrete 27 ... Bent bolt hole 29 ... Skin plate 31 ... Side plate 33 ... Joint Plate 35 ... Vertical rib 37 ... Joint hole 39 ... Joint hole 41 ... Frame plate 43 ... Skin plate 45 ... Side plate 47 ... Joint plate 49 ... Vertical rib 51 ... Joint hole 53 ... Joint plate 57 …… Junction hole 59 …… Reinforcing member hole 61 …… Load transmission member 65 …… Frame plate 67 …… Packing 69 …… Entrance room 71 …… Shielding machine 73 …… Muddy water 75 …… Ear 77 ...... jack 79 ...... waterproofing cover 81 ...... reinforcing member end 83 ...... fall prevention fitting 85 ...... caisson shafts

Claims (6)

A method of passing a shield machine through an underground structure,
Forming the shield passage part of the underground structure with unreinforced concrete and providing a reinforcing member in the shield passage part;
Providing a frame so as to surround the shield passage part; and
C) injecting a liquid between the underground structure and the frame, and making the water pressure in the frame substantially equal to the soil water pressure outside the underground structure;
Removing the reinforcing member d;
A step e of excavating the shield passage portion with a shield machine;
Comprising
In the step a, a first water stop member is provided in the vicinity of one end of the reinforcing member,
In the step d, the reinforcing member is fixed to the first water-stopping member before the tip of the reinforcing member comes out of the first water-stopping member, and the shield passes through the underground structure. Method. In the step a, a second water stop member is further provided in the vicinity of the other end of the reinforcing member,
2. The underground according to claim 1, wherein, in the step d, a water-stopping lid is provided at an end of the second water-stopping member in a state where a tip of the reinforcing member is in the second water-stopping member. How to pass the shield machine to the structure. The underground structure is a shield tunnel;
The step a is a step of installing a segment having an unreinforced concrete portion in the shield passage portion of the shield tunnel while constructing the shield tunnel by a shield machine,
The method of passing a shield machine to an underground structure according to claim 1 or 2, wherein the step d extracts the reinforcing member in a circumferential direction of the shield tunnel. The underground structure is a caisson shaft;
The step a is a step of forming the shield passing portion of the caisson with unreinforced concrete,
Further comprising a step f of laying the caisson after the step a;
The method of passing a shield machine to an underground structure according to claim 1 or 2, wherein the step (d) extracts the reinforcing member in a substantially vertical direction or a substantially horizontal direction in the caisson shaft.   The method of passing a shield machine to an underground structure according to any one of claims 1 to 4, wherein a load transmission member is provided between the reinforcing member and the underground structure in the step a. .   The method for passing a shield machine to an underground structure according to any one of claims 1 to 5, wherein a guide for the reinforcing member is provided in the step a.

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